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annotate mercurial/bundle2.py @ 20856:8a6a86c9a5b5

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bundle2: support bundling of empty part (with a type) Here start the work on bundle2 parts. Our first step is to be able to bundle a simplistic part that just have a type, no parameters, empty payload.
author Pierre-Yves David <pierre-yves.david@fb.com>
date Tue, 18 Mar 2014 14:29:33 -0700
parents 2631204d7305
children 9a75d2559cff
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1 # bundle2.py - generic container format to transmit arbitrary data.
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2 #
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3 # Copyright 2013 Facebook, Inc.
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7 """Handling of the new bundle2 format
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8
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9 The goal of bundle2 is to act as an atomically packet to transmit a set of
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10 payloads in an application agnostic way. It consist in a sequence of "parts"
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11 that will be handed to and processed by the application layer.
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12
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13
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14 General format architecture
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15 ===========================
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16
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17 The format is architectured as follow
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18
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19 - magic string
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20 - stream level parameters
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21 - payload parts (any number)
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22 - end of stream marker.
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23
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24 the Binary format
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25 ============================
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26
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27 All numbers are unsigned and big endian.
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28
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29 stream level parameters
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30 ------------------------
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31
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32 Binary format is as follow
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33
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34 :params size: (16 bits integer)
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35
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36 The total number of Bytes used by the parameters
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37
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38 :params value: arbitrary number of Bytes
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39
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40 A blob of `params size` containing the serialized version of all stream level
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41 parameters.
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42
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43 The blob contains a space separated list of parameters. parameter with value
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44 are stored in the form `<name>=<value>`. Both name and value are urlquoted.
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45
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46 Empty name are obviously forbidden.
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47
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48 Name MUST start with a letter. If this first letter is lower case, the
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49 parameter is advisory and can be safefly ignored. However when the first
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50 letter is capital, the parameter is mandatory and the bundling process MUST
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51 stop if he is not able to proceed it.
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52
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53 Stream parameters use a simple textual format for two main reasons:
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54
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55 - Stream level parameters should remains simple and we want to discourage any
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56 crazy usage.
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57 - Textual data allow easy human inspection of a the bundle2 header in case of
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58 troubles.
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60 Any Applicative level options MUST go into a bundle2 part instead.
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61
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62 Payload part
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63 ------------------------
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64
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65 Binary format is as follow
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66
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67 :header size: (16 bits inter)
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68
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69 The total number of Bytes used by the part headers. When the header is empty
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70 (size = 0) this is interpreted as the end of stream marker.
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71
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72 :header:
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73
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74 The header defines how to interpret the part. It contains two piece of
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75 data: the part type, and the part parameters.
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76
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77 The part type is used to route an application level handler, that can
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78 interpret payload.
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79
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80 Part parameters are passed to the application level handler. They are
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81 meant to convey information that will help the application level object to
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82 interpret the part payload.
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83
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84 The binary format of the header is has follow
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85
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86 :typesize: (one byte)
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87 :typename: alphanumerical part name
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88 :option: we do not support option yet this denoted by two 16 bites zero.
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89
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90 :payload:
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91
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92 The current payload is a 32bit integer with a value of 0. This is
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93 considered an "empty" payload.
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94 """
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95
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96 import util
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97 import struct
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98 import urllib
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99 import string
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100
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101 import changegroup
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102 from i18n import _
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103
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104 _pack = struct.pack
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105 _unpack = struct.unpack
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106
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107 _magicstring = 'HG20'
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108
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109 _fstreamparamsize = '>H'
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110 _fpartheadersize = '>H'
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111 _fparttypesize = '>B'
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112
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113 class bundle20(object):
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114 """represent an outgoing bundle2 container
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115
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116 Use the `addparam` method to add stream level parameter. and `addpart` to
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117 populate it. Then call `getchunks` to retrieve all the binary chunks of
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118 datathat compose the bundle2 container."""
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119
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120 def __init__(self, ui):
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121 self.ui = ui
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122 self._params = []
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123 self._parts = []
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124
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125 def addparam(self, name, value=None):
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126 """add a stream level parameter"""
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127 if not name:
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128 raise ValueError('empty parameter name')
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129 if name[0] not in string.letters:
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130 raise ValueError('non letter first character: %r' % name)
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131 self._params.append((name, value))
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132
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133 def addpart(self, part):
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134 """add a new part to the bundle2 container
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135
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136 Parts contains the actuall applicative payload."""
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137 self._parts.append(part)
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138
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139 def getchunks(self):
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140 self.ui.debug('start emission of %s stream\n' % _magicstring)
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141 yield _magicstring
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142 param = self._paramchunk()
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143 self.ui.debug('bundle parameter: %s\n' % param)
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144 yield _pack(_fstreamparamsize, len(param))
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145 if param:
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146 yield param
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147
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148 self.ui.debug('start of parts\n')
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149 for part in self._parts:
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150 self.ui.debug('bundle part: "%s"\n' % part.type)
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151 for chunk in part.getchunks():
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152 yield chunk
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153 self.ui.debug('end of bundle\n')
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154 yield '\0\0'
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155
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156 def _paramchunk(self):
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157 """return a encoded version of all stream parameters"""
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158 blocks = []
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159 for par, value in self._params:
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160 par = urllib.quote(par)
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161 if value is not None:
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162 value = urllib.quote(value)
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163 par = '%s=%s' % (par, value)
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164 blocks.append(par)
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165 return ' '.join(blocks)
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166
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167 class unbundle20(object):
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168 """interpret a bundle2 stream
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169
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170 (this will eventually yield parts)"""
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171
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172 def __init__(self, ui, fp):
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173 self.ui = ui
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174 self._fp = fp
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175 header = self._readexact(4)
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176 magic, version = header[0:2], header[2:4]
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177 if magic != 'HG':
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178 raise util.Abort(_('not a Mercurial bundle'))
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179 if version != '20':
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180 raise util.Abort(_('unknown bundle version %s') % version)
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181 self.ui.debug('start processing of %s stream\n' % header)
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182
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183 def _unpack(self, format):
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184 """unpack this struct format from the stream"""
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185 data = self._readexact(struct.calcsize(format))
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186 return _unpack(format, data)
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187
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188 def _readexact(self, size):
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189 """read exactly <size> bytes from the stream"""
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190 return changegroup.readexactly(self._fp, size)
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191
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diff changeset
192 @util.propertycache
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193 def params(self):
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194 """dictionnary of stream level parameters"""
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195 self.ui.debug('reading bundle2 stream parameters\n')
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196 params = {}
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197 paramssize = self._unpack(_fstreamparamsize)[0]
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198 if paramssize:
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diff changeset
199 for p in self._readexact(paramssize).split(' '):
20810
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diff changeset
200 p = p.split('=', 1)
20812
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diff changeset
201 p = [urllib.unquote(i) for i in p]
20810
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diff changeset
202 if len(p) < 2:
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diff changeset
203 p.append(None)
20844
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diff changeset
204 self._processparam(*p)
20810
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diff changeset
205 params[p[0]] = p[1]
20805
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diff changeset
206 return params
20802
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diff changeset
207
20844
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diff changeset
208 def _processparam(self, name, value):
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diff changeset
209 """process a parameter, applying its effect if needed
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diff changeset
210
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diff changeset
211 Parameter starting with a lower case letter are advisory and will be
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diff changeset
212 ignored when unknown. Those starting with an upper case letter are
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diff changeset
213 mandatory and will this function will raise a KeyError when unknown.
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214
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diff changeset
215 Note: no option are currently supported. Any input will be either
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diff changeset
216 ignored or failing.
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diff changeset
217 """
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218 if not name:
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219 raise ValueError('empty parameter name')
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diff changeset
220 if name[0] not in string.letters:
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diff changeset
221 raise ValueError('non letter first character: %r' % name)
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diff changeset
222 # Some logic will be later added here to try to process the option for
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diff changeset
223 # a dict of known parameter.
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diff changeset
224 if name[0].islower():
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diff changeset
225 self.ui.debug("ignoring unknown parameter %r\n" % name)
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diff changeset
226 else:
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diff changeset
227 raise KeyError(name)
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diff changeset
228
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diff changeset
229
20802
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230 def __iter__(self):
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231 """yield all parts contained in the stream"""
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diff changeset
232 # make sure param have been loaded
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diff changeset
233 self.params
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234 self.ui.debug('start extraction of bundle2 parts\n')
20802
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diff changeset
235 part = self._readpart()
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diff changeset
236 while part is not None:
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diff changeset
237 yield part
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diff changeset
238 part = self._readpart()
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diff changeset
239 self.ui.debug('end of bundle2 stream\n')
20802
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diff changeset
240
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diff changeset
241 def _readpart(self):
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diff changeset
242 """return None when an end of stream markers is reach"""
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diff changeset
243 headersize = self._readexact(2)
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diff changeset
244 assert headersize == '\0\0'
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diff changeset
245 return None
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diff changeset
246
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diff changeset
247 class part(object):
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248 """A bundle2 part contains application level payload
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249
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parents: 20844
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250 The part `type` is used to route the part to the application level
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parents: 20844
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251 handler.
8a6a86c9a5b5 bundle2: support bundling of empty part (with a type)
Pierre-Yves David <pierre-yves.david@fb.com>
parents: 20844
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252 """
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Pierre-Yves David <pierre-yves.david@fb.com>
parents: 20844
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253
8a6a86c9a5b5 bundle2: support bundling of empty part (with a type)
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parents: 20844
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254 def __init__(self, parttype):
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255 self.type = parttype
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parents: 20844
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256
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parents: 20844
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257 def getchunks(self):
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parents: 20844
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258 ### header
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259 header = [_pack(_fparttypesize, len(self.type)),
8a6a86c9a5b5 bundle2: support bundling of empty part (with a type)
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parents: 20844
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260 self.type,
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parents: 20844
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261 '\0\0', # No option support for now.
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parents: 20844
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262 ]
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parents: 20844
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263 headerchunk = ''.join(header)
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264 yield _pack(_fpartheadersize, len(headerchunk))
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265 yield headerchunk
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parents: 20844
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266 # force empty part for now
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267 yield '\0\0\0\0'
20802
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parents: 20801
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268
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269